1use anyhow::{anyhow, Context, Result};
  2use serde::{Deserialize, Serialize};
  3use std::ffi::OsStr;
  4use std::fmt;
  5use std::str::FromStr;
  6
  7pub use git2 as libgit;
  8pub use lazy_static::lazy_static;
  9
 10pub mod blame;
 11pub mod commit;
 12pub mod diff;
 13pub mod permalink;
 14
 15lazy_static! {
 16    pub static ref DOT_GIT: &'static OsStr = OsStr::new(".git");
 17    pub static ref GITIGNORE: &'static OsStr = OsStr::new(".gitignore");
 18}
 19
 20#[derive(Clone, Copy, Eq, Hash, PartialEq)]
 21pub struct Oid(libgit::Oid);
 22
 23impl Oid {
 24    pub fn from_bytes(bytes: &[u8]) -> Result<Self> {
 25        let oid = libgit::Oid::from_bytes(bytes).context("failed to parse bytes into git oid")?;
 26        Ok(Self(oid))
 27    }
 28
 29    pub fn as_bytes(&self) -> &[u8] {
 30        self.0.as_bytes()
 31    }
 32
 33    pub(crate) fn is_zero(&self) -> bool {
 34        self.0.is_zero()
 35    }
 36}
 37
 38impl FromStr for Oid {
 39    type Err = anyhow::Error;
 40
 41    fn from_str(s: &str) -> std::prelude::v1::Result<Self, Self::Err> {
 42        libgit::Oid::from_str(s)
 43            .map_err(|error| anyhow!("failed to parse git oid: {}", error))
 44            .map(|oid| Self(oid))
 45    }
 46}
 47
 48impl fmt::Debug for Oid {
 49    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 50        fmt::Display::fmt(self, f)
 51    }
 52}
 53
 54impl fmt::Display for Oid {
 55    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 56        self.0.fmt(f)
 57    }
 58}
 59
 60impl Serialize for Oid {
 61    fn serialize<S>(&self, serializer: S) -> std::prelude::v1::Result<S::Ok, S::Error>
 62    where
 63        S: serde::Serializer,
 64    {
 65        serializer.serialize_str(&self.0.to_string())
 66    }
 67}
 68
 69impl<'de> Deserialize<'de> for Oid {
 70    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
 71    where
 72        D: serde::Deserializer<'de>,
 73    {
 74        let s = String::deserialize(deserializer)?;
 75        s.parse::<Oid>().map_err(serde::de::Error::custom)
 76    }
 77}
 78
 79impl Default for Oid {
 80    fn default() -> Self {
 81        Self(libgit::Oid::zero())
 82    }
 83}
 84
 85impl From<Oid> for u32 {
 86    fn from(oid: Oid) -> Self {
 87        let bytes = oid.0.as_bytes();
 88        debug_assert!(bytes.len() > 4);
 89
 90        let mut u32_bytes: [u8; 4] = [0; 4];
 91        u32_bytes.copy_from_slice(&bytes[..4]);
 92
 93        u32::from_ne_bytes(u32_bytes)
 94    }
 95}
 96
 97impl From<Oid> for usize {
 98    fn from(oid: Oid) -> Self {
 99        let bytes = oid.0.as_bytes();
100        debug_assert!(bytes.len() > 8);
101
102        let mut u64_bytes: [u8; 8] = [0; 8];
103        u64_bytes.copy_from_slice(&bytes[..8]);
104
105        u64::from_ne_bytes(u64_bytes) as usize
106    }
107}